含粒子半透明流层光谱吸收的rn 蒙特卡罗法模拟

摘要

Presents the water layer with particles taken as the example, its overall spectral absorptivities and the spectral absorptive distribution along the inside depth for parallel irradiation at various incident angles, and the influences of the water layer on the absorption by the attenuation coefficient and scattering albedo of particles and the incident angle of the irradiation, and concludes from the results that the incident angle, for normal situation, has a little influence on the absorption distribution in the fluid layer and the presence of particles may either increase or decrease the absorption of the fluid layer and the scattering effects result in the appearance of the maximum absorption quotient inside the fluid layer other than just on the surface.%将蒙特卡罗方法用于模拟含粒子的半透明流体层对入射辐射的光谱吸收特性，考虑了粒子的吸收与各向同性散射影响．以含粒子水层为例，计算了其对不同光谱平行入射辐射的吸收率及不同深度处的吸收份额分布，分析了粒子系衰减系数、散射反照率及入射辐射的入射角度等因素对水层吸收特性的影响．研究结果表明，外部辐射的入射角度在通常的应用范围内对流体层内的吸收分布影响较小；粒子作用使流体层的吸收能力发生改变；粒子散射使流体层对入射辐射能的最大吸收处偏离表面．